以齐家北油田古708区块为例,针对该区块低孔低渗储层物性差、非均质性强,测井响应受岩性等因素影响,无法准确识别储层流体性质的实际情况,提出了利用侵入因子与视自然电位差交会图识别地层流体的方法。统计结果显示,对于物性较好的储层,侵入因子大于0.18即可将水层识别出来,对于物性较差的储层,侵入因子为0.45,视自然电位差(ASP)为22,可以将差油层和干层区分开发。利用该方法对控制井古64-79井F19号小层和探井古704井F17号小层进行解释,其结论与试油资料相一致。为了验证该方法的适用性,通过对古708区块37个有试油资料的层段进行测试,显示有33个层段符合,符合率达到89.2%,该方法对低孔低渗复杂储层流体识别有一定的指导意义。由于低孔、低渗储层的特殊性,其相应的测井流体识别方法也应随油田开发程度的深入而不断改进和提高。 Taking the ancient 708 block in Qijiabei Oilfield as an example, the physical properties of reservoir fluid can not be accurately identified due to poor physical properties of low-porosity and low-permeability reservoirs, strong heterogeneity and lithology of logging response. In this paper, we present a method to identify the formation fluid by using the intersection diagram of invasion factor and natural potential difference. The statistical results show that for reservoirs with better physical properties, the water layer can be identified if the intrusion factor is greater than 0.18. For the reservoir with poor physical properties, the intrusion factor is 0.45 and the natural potential difference (ASP) is 22, which can reduce the difference Oil layer and dry layer are developed separately. This method is used to explain the small layer F19 of Well 64-79 and Well F17 of Well Furu of Well B in Control Well. The conclusion is consistent with that of oil test. In order to validate the applicability of this method, we tested 37 intervals of oil-bearing data in the ancient 708 block and found that 33 intervals coincide with a coincidence rate of 89.2%. This method is applicable to complex reservoirs with low porosity and low permeability Fluid identification has some guiding significance. Due to the particularity of low-porosity and low-permeability reservoirs, the corresponding methods for identifying well fluids should also be continuously improved and enhanced with the development of oilfields.